Excessive extreme behavior has great damage to the environment. Growing vegetables requires pesticides or some drugs to drive away pests. Even organic vegetables are difficult to achieve 100 baxian without pesticides.

Among vegetarians, vegetables and plants do not belong to big life, even plants in science belong to life. Because the vitality of plants is relatively weak compared with animals. Therefore, plants are not a complete life.

Ruthless sentient beings are Buddhism's classification of plants. That is to say, plants have no clear feelings, even pain. The theory of soul is not a primitive Buddhist view, so it is impossible to comment.